Spray gun

ABSTRACT

A swivel connector for a spray gun includes a first portion, the first portion including a first interior passage that extends entirely through the first portion along a longitudinal axis and a second a second interior passage that extends along a first axis perpendicular to the longitudinal axis. The swivel connector also includes a second portion coupled to the first portion, the second portion including a third interior passage that extends entirely through the second portion along the longitudinal axis, and a fourth interior passage that extends along a second axis perpendicular to the longitudinal axis. The swivel connector also includes a connector pin coupled to both the first portion and the second portion, wherein the connector pin includes a fifth interior passage that extends along the longitudinal axis.

BACKGROUND

Spray guns are used to inject polyurethane foam underneath concrete forthe purpose of raising the concrete and filling voids in the concrete.Spray guns typically receive a liquid isocyanate, also referred to as an“A” component, and a liquid blend of polyols, also referred to as a “B”component. These two components are mixed in a mix chamber of the spraygun to form the polyurethane foam. The polyurethane foam is then purgedwith pressurized air from a fluid housing of the spray gun. However,current spray guns are often bulky, require excessive numbers ofcomponents, and are difficult to assemble and disassemble. Thus, thereis a need for a more versatile spray gun that will reduce downtime,increase productivity, and lower repair costs.

SUMMARY

In accordance with one embodiment, a fluid housing for a spray gunincludes a main body with a first inlet for connection to a source ofpressurized air, a second inlet for connection to a source of a firstpolyurethane foam component, and a third inlet for connection to asource of a second polyurethane foam component, the main body furtherincluding a valve block having a center gear, a first valve gear coupledto and driven by the center gear, a second valve gear coupled to anddriven by the center gear, and a third valve gear coupled to and drivenby the center gear

In accordance with another embodiment, a fluid housing for a spray gunincludes a main body with a first inlet for connection to a source ofpressurized air, a second inlet for connection to a source of a firstpolyurethane foam component, and a third inlet for connection to asource of a second polyurethane foam component. The fluid housing alsoincludes a mix block coupled to the main body, wherein the mix blockincludes a set of internal threads. The fluid housing also includes alever coupled to the main body, wherein the lever is adjustable to anOFF position where no air or polyurethane components are permitted tomove through the main body, an AIR position where only air is permittedto move through the main body, and a FOAM position where only the firstand second polyurethane foam components are permitted to move throughthe main body

In accordance with another embodiment, a swivel connector for a spraygun includes a first portion, the first portion including a firstinterior passage that extends entirely through the first portion along alongitudinal axis and a second a second interior passage that extendsalong a first axis perpendicular to the longitudinal axis. The swivelconnector also includes a second portion coupled to the first portion,the second portion including a third interior passage that extendsentirely through the second portion along the longitudinal axis, and afourth interior passage that extends along a second axis perpendicularto the longitudinal axis. The swivel connector also includes a connectorpin coupled to both the first portion and the second portion, whereinthe connector pin includes a fifth interior passage that extends alongthe longitudinal axis.

In accordance with another embodiment, a swivel connector for a spraygun includes a first portion and a second portion coupled to the firstportion, the second portion including a first interior passage thatextends along a longitudinal axis and a second interior passage thatextends along an axis perpendicular to the longitudinal axis, whereinthe first interior passage defines an interior space. The swivelconnector also includes a spring-biased locking member coupled to thesecond portion, wherein a portion of the spring-biased locking memberextends into the second interior passage and is biased perpendicular tothe longitudinal axis and radially-inwardly toward to first interiorpassage.

In accordance with another embodiment, an injection port for a spray gunincludes a first end and a second end disposed opposite the first endalong a longitudinal axis. The injection port also includes an interiorpassage extending between the first end and the second end along thelongitudinal axis, and a plurality of blind bores disposed at the firstend, each blind bore extending perpendicular to the longitudinal axis.

In accordance with another embodiment, an injection port for a spray gunincludes a first end and a second end disposed opposite the first endalong a longitudinal axis. The injection port also includes an interiorpassage extending between the first end and the second end along thelongitudinal axis, and a set of external threads disposed adjacent thefirst end, wherein the external threads include a plurality of differentstarting points.

In accordance with another embodiment, a spray gun includes a fluidhousing having a main body with a first inlet for connection to a sourceof pressurized air, a second inlet for connection to a source of a firstpolyurethane foam component, and a third inlet for connection to asource of a second polyurethane foam component. The fluid housing alsoincludes a mix block coupled to the main body, wherein the mix blockincludes a set of internal threads. The fluid housing also includes alever coupled to the main body, wherein the lever is adjustable to anOFF position where no air or polyurethane components are permitted tomove through the main body, an AIR position where only air is permittedto move through the main body, and a FOAM position where only the firstand second polyurethane foam components are permitted to move throughthe main body. The spray gun also includes a swivel connector releasablycoupled to the fluid housing. The swivel connector includes a firstportion and a second portion coupled to the first portion. The secondportion includes a first interior passage that extends along alongitudinal axis and a second interior passage that extends along anaxis perpendicular to the longitudinal axis, wherein the first interiorpassage defines an interior space. The swivel connector also includes aspring-biased locking member coupled to the second portion, wherein aportion of the spring-biased locking member extends into the secondinterior passage and is biased perpendicular to the longitudinal axisand radially-inwardly toward to first interior passage. The spray gunalso includes an injection port releasably coupled to the swivelconnector, the injection port having a first end and a second enddisposed opposite the first end along a longitudinal axis. An interiorpassage extends between the first end and the second end along thelongitudinal axis. The injection port also includes a plurality of blindbores disposed at the first end, wherein each blind bore extendsperpendicular to the longitudinal axis.

Other aspects of the invention will become apparent by consideration ofthe detailed description and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an operator using a spray gun inaccordance with one embodiment.

FIG. 2 is a schematic, exploded rear view of a fluid housing of thespray gun.

FIG. 3 is a schematic, exploded side view of the fluid housing.

FIG. 4 is a schematic, exploded bottom view of the fluid housing.

FIG. 4A is a schematic view of the fluid housing, illustrating threeball valves.

FIG. 5 is a schematic, perspective view of the fluid housing.

FIGS. 6A and 6B are perspective views of a swivel connector of the spraygun.

FIG. 6C is a perspective view of the swivel connector and a washer.

FIG. 7A is a side view of a first portion of the swivel connector, and alock screw that is removably inserted into the first portion.

FIG. 7B is a side view of a connector pin of the swivel connector.

FIG. 7C is a side view of a second portion of the swivel connector.

FIG. 8A is a rear view of the assembled swivel connector, fullyassembled.

FIG. 8B is a side view of the swivel connector, fully assembled.

FIG. 8C is a front view of the swivel connector, fully assembled.

FIG. 9 is a side view of an injection port of the spray gun.

FIG. 10 is a perspective view of the injection port.

FIG. 11 is a side view of the injection port, illustrating an interiorpassage in the injection port.

FIG. 12 is a front view of the injection port.

FIG. 12A is a perspective view of the injection port and a washer.

FIG. 12B is a side view of the injection port, illustrating a sleeve andcheck ball.

FIG. 13 is a perspective view of the swivel connector and the injectionport, coupled together.

FIG. 14 is a perspective exploded view of the spray gun.

It should be understood that the invention is not limited in itsapplication to the details of construction and the arrangements of thecomponents set forth in the following description or illustrated in theabove-described drawings. The invention is capable of other embodimentsand of being practiced or being carried out in various ways. Also, it isto be understood that the phraseology and terminology used herein is forthe purpose of description and should not be regarded as limiting.

DETAILED DESCRIPTION

A “polyurethane foam” as used herein refers to polymers that contain themolecular structure of urethane —(—NH—CO—O—)—, urea —(—NH—CO—NH—)—, orboth. Such polymers are typically obtained by reacting polyisocyanates,also referred to as the “A” component, with isocyanate-reactivecompounds such as polyols, also referred to as the “B” component, oftenusing foaming agents. As used herein, the terms “top,” “bottom,”“front,” “rear,” “side,” “upwardly,” “downwardly,” and other directionalterms are not intended to require any particular orientation, but areinstead used for purposes of description only.

FIGS. 1 and 14 are perspective views of a spray gun 10 that receivesboth “A” and “B” components and mixes the two components, therebyforming a polyurethane foam. The spray gun 10 sprays the polyurethanefoam with the use of pressurized air. The spray gun 10 includes a fluidhousing 14, a swivel connector 18 releasably coupled to the fluidhousing 14, and an injection port 22 releasably coupled to the swivelconnector 18.

With reference to FIG. 2, the fluid housing 14 includes a main body 26.The main body 26 includes a first inlet 30 for connection to a source ofpressurized air, a second inlet 34 for connection to a source of the “A”component, and a third inlet 38 for connection to a source of the “B”component. In the illustrated embodiment, each of the first inlet 30,the second inlet 34, and the third inlet 38 are disposed along a rearwall 42 of the main body 26. In other embodiments one or more of thefirst inlet 30, the second inlet 34, and the third inlet 38 are disposedat other locations along the main body 26.

With continued reference to FIG. 2, the fluid housing 14 furtherincludes a gage mounting block 46. The gage mounting block 46 is coupledto the main body 26 (e.g., with one or more fasteners, not shown), andis sealed to the main body 26 with one or more sealing members 48 (e.g.,O-rings). The gage mounting block 46 includes one or more mountingmembers 50 (e.g., threaded apertures, threaded posts, etc.) to mount oneor more gages 54 (FIG. 1). In the illustrated embodiment, the gages 54indicate an air pressure at the first inlet 30, a pressure of the “A”component at the second inlet 34, and/or a pressure of the component “B”at the third inlet 38, although other numbers and types of gages mayalso be used.

With continued reference to FIG. 2, the fluid housing 14 furtherincludes a handle 58. The handle 58 is coupled to the main body 26(e.g., integrally formed with the main body 26, or coupled to the mainbody 26 with one or more fasteners).

With reference to FIGS. 3,4 and 4A, the main body 26 includes a valveblock 62, a valve block cover 66 coupled to the valve block 62, and amix block 70 coupled to the valve block 62. The valve block 62 includesa center gear 74, a first valve gear 78 coupled to (e.g., directlycoupled to) and driven by the center gear 74, a second valve gear 82coupled to (e.g., indirectly coupled to) and driven by the center gear74, and a third valve gear 86 coupled to (e.g., directly coupled to) anddriven by the center gear 74. As illustrated in FIGS. 3 and 4, sealingmembers 90 and 92 are coupled over and underneath the center gear 74,respectively. Additionally, the first valve gear 78 fits over a firstvalve gear post 94, the second valve gear 82 fits over a second valvegear post 98, and the third valve gear 86 fits over a third valve gearpost 102.

The valve block cover 66 fits over each of the center gear 74, the firstvalve gear 78, the second valve gear 82, the third valve gear 86, thesealing members 90 and 92, the first valve gear post 94, the secondvalve gear post 98, and the third valve gear post 102. In someembodiment the valve block cover 66 is removably coupled to the valveblock 62, so that the valve block cover 66 may be removed formaintenance and repair of one or more of the center gear 74, the firstvalve gear 78, the second valve gear 82, the third valve gear 86, thesealing members 90 and 92, the first valve gear post 94, the secondvalve gear post 98, and the third valve gear post 102.

With reference to FIG. 4A, the first valve gear post 94 is coupled to afirst ball valve 103 (shown in a closed position), the second valve gearpost 98 is coupled to a second ball valve 104 (shown in a closedposition), and the third valve gear post 102 is coupled to a third ballvalve 105 (shown in a closed position).

With continued reference to FIGS. 3 and 4, the valve block 62 furtherincludes a first check valve 106, a second check valve 110, and a thirdcheck valve 114. As illustrated in FIG. 3, the first check valve 106 isaligned with the first valve gear 78 and with the first inlet 30 (forair), the second check valve 110 is aligned with the second valve gear82 and with the second inlet 34 (for the “A” component), and the thirdcheck valve 114 is aligned with the third valve gear 86 and with thethird inlet 38 (for the “B” component). Sealing members 116 (e.g.,O-rings) are provided for each of the check valves 106, 110, 114 to sealthe check valves 106, 110, 114 within the fluid housing 14.

With continued reference to FIGS. 3 and 4, the valve block cover 66includes a knob 118 that is coupled to the center gear 74, such thatrotation of the knob 118 rotates the center gear 74, and thus at leastone of the first valve gear 78, the second valve gear 82, the thirdvalve gear 86. As illustrated in FIG. 3, in some embodiments the valveblock cover 66 includes markings that indicate each of an “AIR”position, an “OFF” position, and a “FOAM” position of the knob 118. Asillustrated in FIGS. 1 and 14, in some embodiments the knob 118 isadditionally coupled to a lever 111, so that an operator may easilyadjust a rotational position of the knob 118 by turning the lever 111.In some embodiments the lever 111 includes a locking pin or otherstructure that prevents the lever 111 from accidentally moving from the“OFF” position to one of the “AIR” or “FOAM” positions.

With reference to FIG. 5, the mix block 70 includes a set of internalthreads 120. With reference to FIGS. 6-8C, the swivel connector 18includes a first portion 122 having external threads 124 that engagewith the internal threads 120 to releasably couple the swivel connector18 to the mix block 70. In other embodiments the mix block 70 includes aset of external threads and the swivel connector 18 includes a set ofinternal threads. In some embodiments, the mix block 70 is coupled tothe swivel connector 18 with structures other than threads.

With reference to FIGS. 5 and 6C, in some embodiments a washer 125 (FIG.6B) is disposed between the mix block 70 and the swivel connector 18 toseal against leakage.

As illustrated in FIG. 7A, the first portion 122 includes a firstinterior passage 126 that extends entirely through the first portion 122along a longitudinal axis 130. The first portion 122 further includes asecond interior passage 132 that extends along an axis 134 that isperpendicular to the longitudinal axis 130. The swivel connector 18further includes a first locking member 138 (e.g., set screw) thatextends into the second interior passage 132 and toward the firstinterior passage 126 (e.g., as seen in FIG. 8B).

With reference to FIGS. 7B and 8B, the swivel connector 18 furtherincludes a connector pin 142. The connector pin 142 includes an enlargedfirst end 146 that extends into the first interior passage 126. Asillustrated in FIG. 8B, when the first locking member 138 is extendedalong the second interior passage 132 and toward the first interiorpassage 126, a surface 148 of the first locking member 138 (e.g., on anangled tip) extends down into the first interior passage 126 and pressesagainst a surface 150 of the enlarged first end 146 of the connector pin142 (e.g., on an angled portion of the enlarged first end 146), therebyinhibiting or preventing axial movement of the connector pin 142 alongthe longitudinal axis 130.

With reference to FIGS. 7C and 8B, the swivel connector 18 also includesa second portion 152. The second portion 152 includes a third interiorpassage 154 that extends entirely through the second portion 152 alongthe longitudinal axis 130, and a set of internal threads 156 along thethird interior passage 154. The second portion 152 further includes afourth interior passage 158 that extends along an axis 162 that isperpendicular to the longitudinal axis 130. As illustrated in FIGS. 6Aand 6B, the swivel connector 18 further includes a second locking member166 (e.g., a spring-biased plunger, or a plunger that manually threadsinto the swivel connector 18) that extends along the fourth interiorpassage 158 and toward the third interior passage 154. In theillustrated construction the second locking member 166 is spring-biasedtoward the third interior passage 154, and includes a distal end 168having a normal position within the third interior passage 154, suchthat the second locking member 166 must be pulled away from the thirdinterior passage 154 against the bias of the second locking member 166to open the third interior passage 154 completely.

With reference to FIGS. 7B, 7C, and 8B, the third interior passage 154defines an interior surface 170 (e.g., circumferential wall) within thesecond portion 152 of the swivel connector 18 that extends perpendicularto the longitudinal axis 130. As illustrated in FIGS. 7B and 8B, theconnector pin 142 includes an enlarged second end 174 having a surface178 that also extends perpendicular to the longitudinal axis 130.

To assemble the swivel connector 18, the connector pin 142 is firstpassed through the third interior passage 154 along the longitudinalaxis 130 (i.e., along a direction to the left in FIGS. 7A-7C), until thesurface 178 of the enlarged second end 174 presses against the interiorsurface 170 and the enlarged first end 146 has passed into the firstinterior passage 126 of the first portion 122. The first locking member138 is then moved down the second interior passage 132 until a portionof the first locking member 138 passes into the first interior passage126 and the surface 148 of the first locking member 138 contacts thesurface 150 of the connector pin 142. In this state, illustrated in FIG.8B, the first portion 122 and the second portion 152 of the swivelconnector 18 are pressed and locked together axially along thelongitudinal axis 130. As illustrated in FIGS. 7B and 8B, the connectorpin 142 itself also includes a fifth interior passage 182. When thefirst portion 122 and the second portion 152 of the swivel connector 18are pressed and locked together, the fifth interior passage 182 isaligned with the first interior passage 126 and the third interiorpassage 154 along the longitudinal axis 130, creating a single overallinterior passage for movement of air and/or polyurethane foam (or othermaterial as desired) through the entire swivel connector 18.

In other constructions, the connector pin 142 is not included, and thefirst portion 122 and the second portion 152 are coupled togetherwithout the connector pin 142 (e.g., by a threaded connection or viaanother connecting structure). In some constructions, the first portion122 and the second portion 152 are integrally coupled together as asingle piece.

With reference to FIGS. 9-12, the injection port 22 includes a first end186 and a second end 190 disposed opposite the first end 186. Asillustrated in FIG. 11, the injection port 22 includes a first interiorpassage 194 that extends entirely from the first end 186 to the secondend 190 along the longitudinal axis 130, such that the first interiorpassage 194 is exposed at opposite ends of the injection port 22. Theinjection port 22 further includes a second interior passage 198, athird interior passage 202, and a fourth interior passage 206 (all threeillustrated in FIG. 12). The second interior passage 198, the thirdinterior passage 202, and the fourth interior passage 206 each extendalong axes 210, 214, 218, respectively, that are perpendicular to thelongitudinal axis 130. Each of the second interior passage 198, thethird interior passage 202, and the fourth interior passage 206 aredisposed at the first end 186 of the injection port 22, and asillustrated in FIG. 12, the second interior passage 198, the thirdinterior passage 202, and the fourth interior passage 206 each defineblind bores that extend towards, but do not intersect, the firstinterior passage 194. While the illustrated embodiment includes threedifferent blind bores at the first end 186 that are spaced equidistantlyfrom one another around the first end 186, other constructions includedifferent numbers or arrangements than that illustrated.

With continued reference to FIGS. 9-12, the injection port 22 furtherincludes a first set of external threads 222 adjacent the first end 186.The first set of external threads 222 engage with the internal threads156 (FIGS. 7C and 8C) in the second portion 152 of the swivel connector18 to couple the injection port 22 to the swivel connector 18. Withreference to FIG. 12, in the illustrated embodiment the first set ofexternal threads 222 are right-hand threads and include three differentthread starting points 226, corresponding to the three different blindbores at the first end 186.

With reference to FIG. 11, the injection port 22 further includes asecond set of external threads 230 that extend from the second end 190toward the first end 186. A tool engagement surface 232 is disposedbetween the first set of external threads 222 and the second set ofexternal threads 230. The tool engagement surface 232 and the second setof external threads 230 are configured to be engaged by a tool, andfacilitate coupling of the injection port 22 into the cement or othermaterial (e.g., by twisting or otherwise threading and securing thesecond end 190 of the injection port 22 into the cement or materialunderneath cement with a wrench or other tool, or into another structurethat has already been drilled or otherwise placed into the concrete orother material), and holding the injection port 22 in place once it hasbeen coupled to the cement or other material.

With continued reference to FIG. 11, the injection port 22 furtherincludes a fifth interior passage 234, disposed at the second end 190 ofthe injection port 22. The fifth interior passage 234 is an aperturethat extends through the entire injection port 22 and passes through thefirst interior passage 194 along a direction that is perpendicular tothe longitudinal axis 130.

With reference to FIG. 12A, in some embodiments a washer 235 is disposedbetween the injection port 22 and the swivel connector 18 to sealagainst leakage.

With reference to FIG. 12B, in some embodiments the injection port 22includes a sleeve 236 and a check ball 237. The sleeve 236 makes a leakproof seal between the concrete (or other material) and the injectionport 22. The check ball 237 inhibits or prevents the polyurethane foamfrom traveling back up the injection port 22 and spilling onto theconcrete or backing up into the swivel connector 18 or fluid housing 14.

With reference to FIGS. 1 and 13, during operation an operator insertsthe injection port 22 into an opening in cement (or other material)until the second end 190 of the injection port 22 and substantially allor all of the second set of external threads 230 are buried underneath atop layer 238 of the cement, leaving the first end 186 of the injectionport 22 exposed above the top layer 238. The injection port 22 isthereby firmly held in the cement, with the longitudinal axis 130extending upwardly and perpendicular to the top layer 238 of the cement,and with the first interior passage 194 of the injection port 22 exposedat the first end 186 of the injection port 22.

During operation the operator also couples the swivel connector 18 tothe fluid housing 14 by inserting the first portion 122 of the swivelconnector 18 into the mix block 70, and engaging the external threads124 of the first portion 122 with the internal threads 120 of the mixblock 70. Once the swivel connector 18 has been coupled to the fluidhousing 14, the operator then lowers the combined fluid housing 14 andswivel connector 18 over the first end 186 of the injection port 22,until the set of internal threads 156 in the second portion 152 of theswivel connector 18 contact the first set of external threads 222adjacent the first end 186 of the swivel connector 18. The operator thenholds the fluid housing 14 still (e.g., holds onto the handle 58), whilerotating the swivel connector 18 relative to the fluid housing 14 andthe injection port 22. As the swivel connector 18 is rotated, theinternal threads 156 engage with one of the three different threadstarting points 226 on the first end 186 of the injection port 22, andbegin to thread with the external threads 222 on the injection port 22.

As the swivel connector 18 is rotated, the second locking member 166(e.g., spring-biased plunger) is initially pressed away from itsnormally radially-inwardly biased position. For example, as illustratedin FIG. 9, the first end 186 of the injection port 22 includes acylindrical region 242 with a first outer surface 246, and a taperedregion 250 with a second outer surface 254. When the swivel connector 18is initially lowered over the first end 186 of the injection port 22,the distal end 168 of the second locking member 166 contacts the secondouter surface 254 of the tapered region 250 and slides along the secondouter surface 254, forcing the second locking member 166 radiallyoutwardly and away from its naturally biased position, until the distalend 168 of the second locking member 166 is in contact with the firstouter surface 246 of the cylindrical region 242. In some embodiments,the operator himself or herself may additionally or alternatively pullradially outwardly on the second locking member 166, to help move thesecond locking member 166 away from its naturally biased position,allowing the swivel connector 18 to fit over and rotate relative to thefirst end 186 of the injection port 22.

As the swivel connector 18 continues to rotate relative to the fluidhousing 14 and the injection port 22, the second locking member 166eventually reaches the second interior passage 198, the third interiorpassage 202, or the fourth interior passage 206 of the swivel connector18 (e.g., one of the three blind bores at the first end 186). The distalend 168 of the second locking member 166 then simply snaps radiallyinwardly into the second interior passage 198, the third interiorpassage 202, or the fourth interior passage 206 (via theradially-inwardly biased nature of the second locking member 166),rotationally locking the swivel connector 18 in place relative to theinjection port 22. Once the swivel connector 18 has been secured to theinjection port 22, the operator then moves the lever 111 from the “OFF”position to either the “AIR” position or the “FOAM” position.

With reference to FIGS. 3 and 4A, in the “OFF” position, the first valvegear 78 is initially in a rotational position where the first ball valve103 is closed and air cannot pass from the first inlet 30 to the mixblock 70, the second valve gear 82 is initially in a rotational positionwhere the second ball valve 104 is closed and the “A” component cannotpass from the second inlet 34 to the mix block 70, and the third valvegear 86 is initially in a rotational position where the third ball valve104 is closed the “B” component cannot pass from the third inlet 38 tothe mix block 70. In some embodiments a first passage extends within thevalve block 62 from the first inlet 30 to the first check valve 106 andthe mix block 70, a second separate passage extends from the secondinlet 34 to the second check valve 110 and the mix block 70, and a thirdseparate passage extends from the third inlet 38 to the third checkvalve 114 and the mix block 70. When the lever 111 is in the “OFF”position, the three passages are blocked by the first ball valve 103,second ball valve 104, and third ball valve 105.

In the “AIR” position, the center gear 74 has been rotated in a firstdirection, causing the first valve gear 78 to rotate, such that airpasses from first inlet 30, through the first ball valve 103 and thefirst check valve 106, through the mix block 70, through the firstinterior passage 126, the fifth interior passage 182 (i.e., through theconnector pin 142), and the third interior passage 154 of the swivelconnector 18 (FIG. 8B), and into the first interior passage 194 of theinjection port 22. The air then travels down the injection port 22, andexits out the second end 190 of the injection port 22 along thelongitudinal axis 130 and/or out the fifth interior passage 234 of theinjection port 22 (FIG. 11), into a region beneath the concrete.Movement of the air under the concrete creates a space for injection ofthe polyurethane foam.

In the “FOAM” position, the center gear 74 has been rotated in a second,opposite direction, causing the second valve gear 82 and the third valvegear 86 to rotate, such that the “A” component and the “B” componentmaterials pass through the mix block 70, through the second ball valve104 and third ball valve 105, and to the first interior passage 126 ofthe swivel connector 18, where the “A” component and the “B” componentmix together to form the polyurethane foam. The polyurethane foam thentravels through the fifth interior passage 182 and the third interiorpassage 154 of the swivel connector 18, and into the first interiorpassage 194 of the injection port 22. The polyurethane foam then travelsdown the injection port 22, and exits out the second end 190 of theinjection port 22 along the longitudinal axis 130 and/or out the fifthinterior passage 234 of the injection port 22, into the space created bythe air.

Once the operator is finished adding foam underneath the concrete, theoperator then moves the handle 111 back to the “OFF” position. Theoperator may then remove swivel connector 18 from the injection port 22(e.g., by pulling radially outwardly on the second locking member 166and rotating the swivel connector 18) and move the fluid housing 14 andthe swivel connector 18 to another injection port 22 (see FIG. 1) to addpolyurethane foam to another area underneath the concrete.

It is understood that the invention may embody other specific formswithout departing from the spirit or central characteristics thereof.The disclosure of aspects and embodiments, therefore, are to beconsidered as illustrative and not restrictive. While specificembodiments have been illustrated and described, other modifications maybe made without significantly departing from the spirit of theinvention.

Various features and advantages of the invention are set forth in thefollowing claims.

What is claimed is:
 1. A swivel connector for a spray gun, the swivelconnector comprising: a first portion, the first portion including afirst interior passage that extends entirely through the first portionalong a longitudinal axis and a second a second interior passage thatextends along a first axis perpendicular to the longitudinal axis; asecond portion coupled to the first portion, the second portionincluding a third interior passage that extends entirely through thesecond portion along the longitudinal axis, and a fourth interiorpassage that extends along a second axis perpendicular to thelongitudinal axis; and a connector pin coupled to both the first portionand the second portion, wherein the connector pin includes a fifthinterior passage that extends along the longitudinal axis.
 2. The swivelconnector of claim 1, further comprising a set of external threadsdisposed on the first portion.
 3. A spray gun comprising: a fluidhousing having a mix block, the mix block including a set of internalthreads; and the swivel connector of claim 2, wherein the externalthreads of the swivel connector are coupled to the internal threads onthe mix block.
 4. The swivel connector of claim 1, further comprising aset of internal threads disposed within the second portion.
 5. A spraygun comprising: an injection port having a set of external threads; andthe swivel connector of claim 4, wherein the external threads of theinjection port are configured to engage with the internal threads of theswivel connector.
 6. The swivel connector of claim 1, further comprisinga locking member coupled to the first portion, wherein the lockingmember is disposed at least partially within the second interiorpassage.
 7. The swivel connector of claim 6, wherein a portion of thelocking member extends into the first interior passage.
 8. The swivelconnector of claim 7, wherein the connector pin includes an enlarged endhaving a first surface, and wherein the portion of the locking memberincludes a second surface that contacts the first surface.
 9. The swivelconnector of claim 6, wherein the locking member is a set screw.
 10. Theswivel connector of claim 1, further comprising a locking member coupledto the second portion, wherein the locking member is disposed at leastpartially within the fourth interior passage.
 11. The swivel connectorof claim 10, wherein a portion of the locking member extends into thethird interior passage.
 12. The swivel connector of claim 10, whereinthe locking member is a spring-biased locking member.
 13. The swivelconnector of claim 1, wherein the connector pin includes an enlarged endhaving a first surface, and wherein the second portion of the swivelconnector includes a second, interior surface that contacts the firstsurface.
 14. A swivel connector for a spray gun, the swivel connectorcomprising: a first portion, a second portion coupled to the firstportion, the second portion including a first interior passage thatextends along a longitudinal axis and a second interior passage thatextends along an axis perpendicular to the longitudinal axis, whereinthe first interior passage defines an interior space; and, aspring-biased locking member coupled to the second portion, wherein aportion of the spring-biased locking member extends into the secondinterior passage and is biased perpendicular to the longitudinal axisand radially-inwardly toward to first interior passage.
 15. The swivelconnector of claim 14, wherein the second portion includes a set ofinternal threads.
 16. A spray gun comprising: an injection port having aset of external threads; and the swivel connector of claim 15, whereinthe external threads of the injection port are configured to engage withthe internal threads of the swivel connector.
 17. A spray guncomprising: an injection port having a plurality of blind bores at afirst end of the injection port; and the swivel connector of claim 15,wherein the spring-biased locking member is biased toward the firstinterior passage, and wherein at least a portion of the spring-biasedlocking member is configured to extend into one of the blind bores toreleasably secure the swivel connector to the injection port.
 18. Theswivel connector of claim 14, further comprising a connector pin that iscoupled to both the first portion and the second portion, and restrainsthe first portion and the second portion from moving apart from oneanother along the longitudinal axis.
 19. The swivel connector of claim18, wherein the connector pin includes an enlarged end, and wherein asurface on the enlarged end contacts a surface within the secondportion.
 20. The swivel connector of claim 14, wherein the first portionis removably coupled to the second portion.